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WSJ had a great piece on head injuries last year.

The problem is that there's nothing any helmet could do to stop the brain from taking lots of small hits. To become certified for sale, a football helmet has to earn a "severity index" score of 1200, according to testing done by the National Operating Committee on Standards for Athletic Equipment, or Nocsae. Dr. Robert Cantu, a Nocsae board member and chief of neurosurgery at Emerson Hospital in Concord, Mass., says that to prevent concussions, helmets would have to have a severity index of 300—about four times better than the standard. "The only way to make that happen, Dr. Cantu says, "is to make the helmet much bigger and the padding much bigger."

The problem with that approach, he says—other than making players look like Marvin the Martian—is that heavier helmets would be more likely to cause neck injuries.

One of the strongest arguments for banning helmets comes from the Australian Football League. While it's a similarly rough game, the AFL never added any of the body armor Americans wear. When comparing AFL research studies and official NFL injury reports, AFL players appear to get hurt more often on the whole with things like shoulder injuries and tweaked knees. But when it comes to head injuries, the helmeted NFL players are about 25% more likely to sustain one.